The key to success with a socket wrench is pattern matching: The socket must match the nut.
成功使用套筒扳手的关键在于模式匹配：套筒扳手必须与螺母相匹配。
It is difficult to pull out the bolt with ordinary socket wrench that can not provide axial tension because of the bolt drilling hole deformation and the collapse of holes.
煤矿井下可回收锚杆一般用于煤层巷道，由于锚杆钻孔的变形和塌孔等原因，用普通套筒扳手拆卸锚杆时，因不能给锚杆提供轴向拉力，很难将锚杆拆卸拔出。
Hexagon wrench size is sometimes referred to "M" followed by the size of the tool or socket, that is, "M6", although this may be confused with the precise criteria for use;
内六角扳手大小有时提到'M'跟随由大小在工具或插口，即'M6'，虽然这也许与准确的标准用途混淆；
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